Pre CSPA Between 4:00 pm and 4:10 pm, Sydney time, the market is...

Pre CSPA

Between 4:00 pm and 4:10 pm, Sydney time, the market is placed in Pre-CSPA. Trading stops and brokers enter, change and cancel orders in preparation for the market closing.
Closing Single Price Auction

The Closing Single Price Auction takes place between 4:10* pm and 4:12 pm, Sydney time.
ASX Trade calculates closing prices during this phase.
*Random + 60 secs

You can enter as much as you want during 4-4:10 (remove before 4:10)

It's just game-playing. I saw the calculated price jump from 53 to 55 and now closed at 58 lol.